GHK Cu: The Copper Peptide And The Claims Around It, GHK Cu is a naturally occurring copper binding tripeptide found in human plasma. Mechanistically, its linked to tissue repair signaling, immune GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Relief of ovalbumin induced airway remodeling by the glycyl l histidyl l lysine Cu2+ tripeptide complex via activation of SIRT1 in airway epithelial cells ScienceDirect Blockade of glucagon receptor induces cell hypersecretion by hyperaminoacidemia in mice Nature Communications